Help with Cat?

My cat who is 3 1/2 years old is a rather stinky cat. I bathe her regularly, but the problem lies in that she doesn't know how to clean herself after she uses the kitty box. She has poo and kitty litter stuck to her after she leaves the box, and promptly goes to lay on my bed afterward. She is making my bed smell like a litter box! I clean her as often as I can, being sure to wipe her . I am to the point of washing my sheets every other day to get the smell out, and I am spending so much money on laundry soap and baby wipes. I am getting so stressed by this. What can I do to teach her how to clean herself and/or not go onto my bed? Any other tips on how to keep her clean?